Double seal valve



Au s, 1948.

M. SITNEY DOUBLE SEAL VALVE Filed March 20, 1945 2 Sheets-Sheet 2 lN VEN TOR. M 3; 5 5.5V SITNEY ATTORNEY Pumas Aug. 3, 19481 X UNITED STATES PATENT, OFFICE DOUBLE SEAL VALVE Massey Sltney, Berkeley, Calif.

Application March 20, 1945, Serial No. 583,830

(Granted under the m of March 3, 1883, as

amended April 30, 1928; 370 0. G. 157) 2 Claims.

This invention relates to a valve particularly adapted for use as an exhaust valve for submarine engines.

When a submarine ls cruising on the surface, the exhaust from the engines is released into the haust gases or other fluids assout of the valve.

normally into the atmosphere.

atmosphere through an exhaust valve. The valve The valve body is preferably water cooled. The body proper is surrounded by a jacket 4 which is provided with inlet andoutlet pipes I and I. Cooling liquid enters the space between the body proper and the jacket through-the inlet Pipe 5 from a suitable source, not shown, and is discharged through the outlet pipe 6.

gine have a tendency to damage the valve so that it is not watertight when closed. To overcome this problem, I have designed a double seal valve which when open will pass exhaust gases without damaging the valve and which when closed is watertight.

It is therefore an object of my invention to provide a valve which is capable of passing hot gases or other fluids when open and which is watertight when closed.

It is a further object of my invention to provide a valve having two seats and two coopcrating valve discs in which the discs are liquid cooled when the valve is open.

It is a further object of my invention to provide a valve mechanism having the characteristics mentioned above and which may be used in existing types of valve bodies and operated by existing types of operating mechanism.

The manner of accomplishment of these and other objects of my invention will become ap-.

parent upon a study of the specification which followsand the drawing wherein: t

Fig. 1 shows a top plan view of the valve of my invention.

Fig. 2 shows avertical sectional view of the valve of my invention, with the valve closed, taken substantially on the line 2-4 of Fig. 1.

Fig. 3 shows a vertical sectional view 0! the valve of my invention similar toFlg. 2, but with the valve open.

Referring more in detail to the drawing:

The valve comprises a body, designated generally as I. This body is structurally similar to,

the valve bodies used in submarine exhaust valves in the prior art. This feature makes it possible to install my improved'valve mechanism in exist- The body has an opening I in the upper wall adapted to receive the valve stem which is vertically slidable through the opening I. The stem may be raised or lowered to operate the valve by any suitable mechanism not shown. The

mechanism may be the identical mechanism used to operate submarine exhaust valves in the prior art, thus making it possible for my improved valve to be installed in a submarine without the necessity of modifying the valve operating mech- V anism.

Adiacent the lower end of the stem is a valve disc, designated generally as I." The valve disc I cured tothe lower piece H as by the bolts illustrated or by other suitablemeans. The upper piece ll has an opening in the center adapted to receive the stem I which terminates in the hollow space within the disc. The disc is thus slidably engaged on the valve stem. The valve stem has a collar l2 adjacent the lower end adapted to bear against the lower surface of the upper ing installations without the necessity of 'replacing the entire valve.

The lower end oi the body is adapted to be secured to the outside wall oi. a submarine or other structure and has an opening 2 to receive exhaust gases or other fluids which may be at quite a high temperature. The body has a dispiece II and thus to transmit upward movement of the stem to the valve disc and to limit downward sliding movement of thedisc relatively to the stem. The lower piece H has a seat portion II extending around the circumference as best shown in Fla. 3. a

A second disc II is slidably engaged with the valve stem above the valve disc. The second disc ll has secured'theretc a resilient gasket ll extending around the circumference. A second collar I8 is secured to the valve stem, as by threaded engagement, above the second disc. The

second collar is is adapted to transmit downward. movement of the stem to the discs and to limit upward sliding movement or the relatively to the stem. h

Located in the space between the valve disc I and the second disc II is a collspring llwhich tends to force the discs apart to theiimits permitted bythe collars l2 and".

The lower portion of the stem I is hollowin V order to provide an inlet arid outlet for the cooli charge 8 in aside well through which the exing system. An inletflttlng id is provided in i walls of the stem, and which terminates in the lower portion of the hollow valve disc 8. A bai'iie plate 20 is secured to the outside of the tube It adjacent the lower end thereof in order to force the cooling liquid into the outer portions of the valve disc I. The major portion or the cooling liquid is discharged from the valve disc through the space between the walls. of the tube l9 and the walls of the stem 8 and thence through the discharge fitting 2|, located in the stem above the valve body.

The upper plate of the valve disc 9 contains a plurality of apertures 22 through which a portion 01' the cooling liquid may pass into the space be tween the discs.

In order to provide an egress tor the cooling liquid which passes into the space between the discs, one or more apertures 23 are provided in the valve body. The inlet ends of the apertures II are aligned with the space between the discs when the valve is open. The outlet ends of the apertures 23 are open to the atmosphere.

, The waive body has a lower seat 24 adapted to cooperate with the seat it on the valve disc I when the valve is closed. The valve body also has an upper seat ll adapted to cooperate with the resilient gasket II on the second disc it when the valve is closed. When sealing the valve, the gasket II is compressed partially against the seat I! and partially against an. upper seating surface 28 formed on disc 0.

Operation The valve is shown in closed position in Fig. 2. The seat It on the valve disc I cooperates with the lower seat 24 on the body and the resilient gasket ll cooperates with the upper seat 25 on the body to seal the valve and make it watertight.

When it is desired to open the valve to permit gases or other fluids to pass therethrough, the stem is raised and may be maintained in raised position by suitable mechanism not shown to the position illustrated in Pig. 3.

vWhen the stem-is raised, the spring I'I first forces the valve disc downward relatively to the stem to the limit permitted by the collar l2. Thus the amount of separation between the discs is immediately increased and the resilient gasket is maintained out of contact with the valve disc, which, although liquid cooled, may attain a relatively high temperature. Further-raising of the stem lifts the valve disc and also the second disc and the associated mechanism to the position shown in Fig. 3. Opening of the valve in this manner thus permits fluids which enter at the inlet 2 to be discharged through the outlet 3.

The cooling liquid inlet i0 is connected to a suitable source of cooling liquid not shown. ordinarily the cooling liquid will be sea water. The cooling liquid passes through the inlet It and tube i! into the hollow valve disc and is diverted by the baiile 2. into the outer portions of the valve disc. The majorv portion of the cooling liquid passes out of the valve disc through the space between the walls oi. the tube It and the walls of the stem I into the outlet II from which it is discharged. A smaller portion of the coolin! liquid passes through the openings 22 in. the upper plate ll of the valve disc into the space between the discs from which it is discharged through the openings 23. Some of the liquid may tend to leak from the space between the discs into the space below the valve disc. Any liquid that does leak into this space is quickly picked up by the exhaust gases or other fluid transmitted by the valve and discharged through the main discharge opening I of the valve, normally into the atmosphere.

Hot fluids passing through the valve may damage theseats 24 and II on the valve body. Damage to these seats is, however, minimized by the cooling liquid between the valve body proper and the jacket 4. The hot fluids may also damage the seat It on the valve disc but this damage is minimized by the cooling liquid within the valve disc. However, the damage that does occur to these metal seats is suflicient to render them incapable of forming a watertight seal after long usage.

The valve is made watertight when closed by the action of the resilient rgasket ll bearing on the seat 25 on the body. By virtue of the action of the spring ll forcing the discs 9 and It apart this gasket is kept in direct contact with and continuously bathed by the cooling liquid whenever the valve is open. There is-a constant flow. of liquid through the apertures 22 into the space resilient gasket contacts the seat 2!, it yields to tit any irregularities produced by the hot fluids on the seat and thus seals the valve. It will be observed that during the closing operation of the.

valve the cooling liquid in the space between the discs is poured over the seat II and the seating surface it and thus cools these parts before the resilient gasket seats. This action cools and moistens the metal seating parts permitting the gasket ll to slide easily onto its seat and elimihating the possibility of vulcanizing the resilient gasket by contact with a hot valve seat.

From .the foregoing, it will be seen that I have provided a valve which is capable of passing hot fluids without damage to the valve and which is watertight when closed. However, it will be ap--' parent to those skilled in the art that the valve is susceptible to numerous modifications without departing from the spirit ofmy invention. Therefore, I do not wish to be limited by the disclosure set forth hereinabove but only by the scope of the appended claims. I

The-invention described herein may be manufactured and used by or for the Government of the United States of America for governmental of any royalties opening in the top of the body and vertically movable therein, a hollow valve disc adjacent the lower end of the stem, a second disc above the valve disc, said discs being slidablyengaged with said stem, said stem having means adjacent the discs acting to transmit vertical movement of the stem to the discs and to limit sliding of the discs along the stem, said valve disc having a seat cooperable with the lower seat on the body and said second disc having a resilient gasket coperable with the upper seat on the body to seal the valve when the stem is lowered, spring means between said valve disc and said second disc acting to separate the discs and maintain the gasket in spacedrelation to the valve, disc when'the stem is raised, and means for. circulating cooling liquid through the discs comprising a tube extending longitudinally through the lower portion of the stem in spaced relation to the walls thereof and having an inlet above the body and a discharge into the lower portion of the .valve disc, said valve disc having a discharge for the cooling liquid in the upper portion thereof into the space between the tube and the walls of the stem, said stem having a discharge above the body, the' upper wall of said valve discliaying one or more openings leading to the 'spacebetween the discs whereby a portion' of the cooling liquid may flow into the space between the discs, said bodyhaving a discharge opening in alignment with the space between the discs when the stem is raised.

2. A valve comprising a body having an inlet in able thereinj, aholiow valve disc engaged with the;

stem adi aceht the lower end thereof, a second disc engagedwith the stem above the valve disc, at

least one of said discs being slidable on said stem,

6 said stem having means adjacent the discs acting to transmit vertical movement of the stem to thediscs and to limit sliding of the discs along the stem, said valve disc having a seat cooperable with the lower seat on the body and said second disc having a resilient gasket cooperable with the upper seat on the body to seal the valvewhen the stem is lowered, spring means between said valve disc and said second disc acting to separate the discs and maintain the gasket in spaced relation to the valve disc when the stem is raised. and means for circulating cooling liquid through the discs, comprising a tube extending longitudinally through a portion of the stemin spaced relation to the walls thereof and having :an inlet above the body and a discharge into the lower portion of-the valve disc, the upper wall of said valve disc having one or more discharge openings arranged in such manner that at least part of the cooling liquid may flow into the space between the discs when the stem is raised.

MASSEY SITN'EY.

REFERENCES CITED la The following references are of record in the file of this patent:

UNITED STATES PATENTS Clapp Feb. 8, 1944 

